<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>converge</title>
</head>

<body>
    <div>打开浏览器控制台查看结果</div>
    <script>
        const converge =
            (converger, handlers) =>
                (...args) =>
                    converger(...handlers.map(h => h.apply(null, args)));
        const average = converge(
            (a, b) => a / b,
            [arr => arr.reduce((a, v) => a + v, 0), arr => arr.length]
        );
        console.log(average([1, 2, 3, 4, 5, 6, 7]));; // 4
    </script>
</body>

</html>